Can you post the aircraft.cfg file here. You can tweak up the cfg alot. Here's a example.
Some people found it could make for better flight in formation by tweaking the [flight_tuning] section. What we did seeing the real Blue Angel F/A-18C Hornets use a big old 40lb spring attached to the flight stick to enable them to fly much tighter. Which in some cases is the reason we have yet to see a female pilot in the Blue Angels. Imagine trying to hold 40lbs in one hand for over a hour during the demo.
Here's what the flight tuning we were thinking of using to achieve this feel
[flight_tuning]
cruise_lift_scalar = 1.0
parasite_drag_scalar = 1.5
induced_drag_scalar = 1.5
elevator_effectiveness = 2.0
aileron_effectiveness = 2.0
rudder_effectiveness = 2.0
pitch_stability = 2.0
roll_stability = 2.0
yaw_stability = 1.5
elevator_trim_effectiveness = 1.0
aileron_trim_effectiveness = 1.0
rudder_trim_effectiveness = 1.0
Everything before was pretty much all at number 1. We found that by adjusting these numbers a bit were able to get close to having that feel of a 40lb spring added. But after some testing we have gone back to the standard cfg flight tuning.
Tooling around with the Elevator, aileron effectiveness might give you better response. Now to make the plane fly faster try editing this one
[TurbineEngineData]
fuel_flow_gain = 0.006 //Gain on fuel flow
inlet_area = 4.2895 //Square Feet, engine nacelle inlet area
rated_N2_rpm = 16728 //RPM, second stage compressor rated value
static_thrust = 11000 //Lbs, max rated static thrust at Sea Level
afterburner_available = 6 //Afterburner stages available?
afterburner_throttle_threshold = 0.80 //Percent of throttle range where a/b begins
reverser_available = 0 //Thrust reverser available?
ThrustSpecificFuelConsumption = 0.81 //Thrust specific fuel consumption (Jets)
AfterBurnThrustSpecificFuelConsumption = 1.74 //TSFC with afterburn/reheat engaged
Make sure you back up your original cfg some where first before you change anything. Hope this helps